The correct answer for the question is Income tax
In the early 1900's, 6 million African Americans emigrated form the rural south of the US to the northeast, mid-west and west and thus began an urban existence in many of the cities in these areas so became important politically due to their numbers and their strong support of the civil rights movement later on.
Answer:
the Three-Fifths Compromise, and the Electoral College.
Explanation:
Answer is B, the railroad system going through the cities.
